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Surface degradation and nanoparticle release of a commercial nanosilica/polyurethane coating under UV exposure / Deborah S. Jacobs in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 5 (09/2016)
[article]
Titre : Surface degradation and nanoparticle release of a commercial nanosilica/polyurethane coating under UV exposure Type de document : texte imprimé Auteurs : Deborah S. Jacobs, Auteur ; Sin-Ru Huang, Auteur ; Yu-Lun Cheng, Auteur ; Savelas Rabb, Auteur ; Justin M. Gorham, Auteur ; Peter J. Krommenhoek, Auteur ; Lee L. Yu, Auteur ; Tinh Nguyen, Auteur ; Lipiin Sung, Auteur Année de publication : 2016 Article en page(s) : p. 735-751 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Essais accélérés (technologie)
Nanoparticules
Photodétérioration
Polyuréthanes
Revêtements -- Analyse:Peinture -- Analyse
Revêtements -- Détérioration:Peinture -- Détérioration
Revêtements -- Effets du rayonnement ultraviolet:Peinture -- Effets du rayonnement ultraviolet
SiliceLa silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux.
La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...).
Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale.Index. décimale : 667.9 Revêtements et enduits Résumé : Many coating properties such as mechanical, electrical, and ultraviolet (UV) resistance are greatly enhanced by the addition of nanoparticles, which can potentially increase the use of nanocoatings for many outdoor applications. However, because polymers used in all coatings are susceptible to degradation by weathering, nanoparticles in a coating may be brought to the surface and released into the environment during the life cycle of a nanocoating. Therefore, the goal of this study is to investigate the process and mechanism of surface degradation and potential particle release from a commercial nanosilica/polyurethane coating under accelerated UV exposure. Recent research at the National Institute of Standards and Technology (NIST) has shown that the matrix in an epoxy nanocomposite undergoes photodegradation during exposure to UV radiation, resulting in surface accumulation of nanoparticles and subsequent release from the composite. In this study, specimens of a commercial polyurethane (PU) coating, to which a 5 mass% surface-treated silica nanoparticle solution was added, were exposed to well-controlled, accelerated UV environments. The nanocoating surface morphological changes and surface accumulation of nanoparticles as a function of UV exposure were measured, along with chemical change and mass loss using a variety of techniques. Particles from the surface of the coating were collected using a simulated rain process developed at NIST, and the collected runoff specimens were measured using inductively coupled plasma optical emission spectroscopy to determine the amount of silicon released from the nanocoatings. The results demonstrated that the added silica nanoparticle solution decreased the photodegradation rate (i.e., stabilization) of the commercial PU nanocoating. Although the degradation was slower than the previous nanosilica epoxy model system, the degradation of the PU matrix resulted in accumulation of silica nanoparticles on the nanocoating surface and release to the environment by simulated rain. These experimental data are valuable for developing models to predict the long-term release of nanosilica from commercial PU nanocoatings used outdoors and, therefore, are essential for assessing the health and environmental risks during the service life of exterior PU nanocoatings. Note de contenu : - EXPERIMENTAL PROCEDURES : Sample preparation - UV exposure
- CHARACTERIZATION : Surface morphology and composition - Chemical degradation - Mass loss - Nanoparticle release
- RESULTS AND DISCUSSION : Surface morphology and composition - Chemical degradation - Mass loss - Nanoparticle release - Mechanism of nanoparticle release by UV exposureDOI : 10.1007/s11998-016-9796-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9796-2.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27107
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 5 (09/2016) . - p. 735-751[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 18316 - Périodique Bibliothèque principale Documentaires Disponible Synthesis and characterization of degradable polyurethane based on poly(ether ester) polyols (PPG-2000 and ε-caprolactone/lactic acid) for marine antifouling / Jie Yi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 3 (05/2015)
[article]
Titre : Synthesis and characterization of degradable polyurethane based on poly(ether ester) polyols (PPG-2000 and ε-caprolactone/lactic acid) for marine antifouling Type de document : texte imprimé Auteurs : Jie Yi, Auteur ; Runtao Ren, Auteur ; Congshu Huang, Auteur ; Chuyi Zhang, Auteur ; Yupu Ma, Auteur Année de publication : 2015 Article en page(s) : p. 525-532 Note générale : Bibliogr. Langues : Américain (ame) Catégories : e-caprolactone
Hydrolyse
Marines (peinture)
Polyéther ester
Polymères -- Biodégradation
Polymères -- Synthèse
Polyols
Revêtements -- Détérioration:Peinture -- Détérioration
Revêtements antisalissures:Peinture antisalissuresIndex. décimale : 667.9 Revêtements et enduits Résumé : Poly(ether ester) polyols consisting of polypropylene glycol-2000 (PPG-2000) and different ratios of ε-caprolactone and lactic acid (LA) had been prepared by polycondensation reactions. Degradable polyurethane (PU) films were prepared with poly (ether ester) polyols and hexamethylene diisocyanate trimer. Hydrolytic degradation experiments demonstrated that PU films could be degradable in artificial seawater. Importantly, the hydrolytic degradation of PU films in artificial seawater increased with the increase of LA content. The results also showed that the surfaces of PU films were renewed and kept active, as revealed by the scanning electron microscope micrographs of degradation PU coatings. Moreover, the copper ion release rates of PU coatings prepared with poly(ether ester) polyols reached steady state at about 35 days. The degradable polyurethanes based on poly(ether ester) polyols (PPG-2000, ε-caprolactone, and LA) could be effective and durable resins for marine antifouling. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of poly(ether ester) polyol - Preparation of PU fils - The determination of properties
- RESULTS AND DISCUSSION : Synthesis and characterization of poly(ether ester) polyols and PU films - Water absorption rate of PU films - Hydrolytic degradation of PU chips - Copper ion release rates of PU coatings - SEM microcraphs of PU-CL10/LA2 coatingsDOI : 10.1007/s11998-014-9646-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-014-9646-z.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24176
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Code-barres Cote Support Localisation Section Disponibilité 17244 - Périodique Bibliothèque principale Documentaires Disponible The case of the contractor who almost got floored / Raymond S. Tombaugh in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 30, N° 5 (05/2013)
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Titre : The case of the contractor who almost got floored Type de document : texte imprimé Auteurs : Raymond S. Tombaugh, Auteur ; Richard A. Burgess, Auteur Année de publication : 2013 Article en page(s) : p. 15-21 Langues : Américain (ame) Catégories : Chimie analytique
Cloquage (défauts)
Matériaux cimentaires
Revêtements -- Défauts:Peinture -- Défauts
Revêtements -- Détérioration:Peinture -- Détérioration
Revêtements -- Effets de l'humidité:Peinture -- Effet de l'humidité
Revêtements de sols:Peinture de solsIndex. décimale : 667.9 Revêtements et enduits Résumé : Most of the past Cases from the F-Files have focused primarily (although not exclusively) on coating failures on steel. However, coating failures can and do occur on other substrates such as aluminum, wood, and concrete, to name a few. In this case, a warehouse concrete floor coating was exhibiting blistering only a few months after installation.
A large existing warehouse building was being modified to house a light manufacturing facility. The floor was constructed of concrete slabs. It was reported that there was no moisture barrier underneath the slabs.
The floor coating project included removal of an original clear coating by portable centrifugai blast cleaning. The new system consisted of four coats that included an epoxy penetrating primer, an aggregate filled epoxy base coat, an epoxy grout coat, and an epoxy finish coat. It was reported that moisture vapor transmission (MVT) testing was performed by the contractor prior to the new coating installation. The testing indicated a low MVT of less than 2 lbs./1,000 square feet/24 hours. Blisters began to appear in the coating within a few months of the floor coating installation (Fig. 1). In this case, aggregate in a concrete floor, in the presence of moisture, caused blistering of the coating system. It is a relatively uncommon problem that could have easily been blamed on the contractor as mis-application of the coating, void of a thorough scientific analysis of the problem (in the field and laboratory) as well as knowledge of concrete substrates. Lets take a closer look.Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19139
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Code-barres Cote Support Localisation Section Disponibilité 15229 - Périodique Bibliothèque principale Documentaires Disponible The case of the mysterious hailstones / E. Bud Senkowski in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 30, N° 2 (02/2013)
[article]
Titre : The case of the mysterious hailstones Type de document : texte imprimé Auteurs : E. Bud Senkowski, Auteur ; Richard A. Burgess, Auteur Année de publication : 2013 Article en page(s) : p. 15-19 Langues : Américain (ame) Catégories : Adhésion -- Défauts
Délaminage
Epaisseur -- Défauts
Grêlons
Revêtements -- Défauts:Peinture -- Défauts
Revêtements -- Détérioration
Revêtements -- Entretien et réparations
Souplesse (mécanique)
Stress -- Effets physiologiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : Specification writers, contractors, and coating manufacturers, at one time or another, have been blamed when installed coatings fail to meet service life expectations. However, rarely does the wrath of mother nature receive the blame for premature coating failure. In this cases from the F-files, an interior roof coating system reportedly failed because of localized impact on the roof exterior from large hailstones during a severe thunderstorm. Can this really happen, at least in this cases ? Let's find out. Note de contenu : - Background
- Site investigation
- Excessive coating thickness
- Flexibility losses
- Internal coating stress
- Lack of adhesive bond
- Other factors affecting coating adhesion
- Effect of hailstone damage
- Recommendations for repairPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17940
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Code-barres Cote Support Localisation Section Disponibilité 14761 - Périodique Bibliothèque principale Documentaires Disponible The effect of surface preparation on coating performance / Patrick Cassidy in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 33, N° 7 (07/2016)
[article]
Titre : The effect of surface preparation on coating performance Type de document : texte imprimé Auteurs : Patrick Cassidy, Auteur ; Paul Slebodnick, Auteur ; James Tagert, Auteur ; James Martin, Auteur Année de publication : 2016 Article en page(s) : p. 50-60 Langues : Américain (ame) Catégories : Analyse des défaillances (fiabilité)
Chlorures
Contamination chimique
Qualité -- Contrôle
Revêtements -- Détérioration:Peinture -- Détérioration
Traîtements de surfaceIndex. décimale : 667.9 Revêtements et enduits Résumé : This article describes a study of the effect of profile type, profile height, the extent of cleanliness and the amount of chloride contamination on coating performance in an effort to determine the correlation between these factors and to ideally identify whether or not there is a primary surface preparation factor that leads to coating failure. Note de contenu : - TEST APPROACH : The effect of profile type - The effect of profile height - The effect of contamination
- RESULTS : The effects of profile type - The effect of profile height - The effect of contamination
- FIGURES : 1. This images shows the final surface profile types - 2. The final panel for exposure with scribes. Note the touched-up areas - 3. This image shows the excessive profile height panel - 4. The final excessive profile height panel ready for exposure - 5. Hand tool prepared panel ready for exposure in Ft. Lauderdale, Fla - 6. Pre-exposure adhesion test results - 7. Post-exposure adhesion results after 1,000 hours as per ASTM B 117 - 8. Post-exposure adhesion results after one year in Key West, Fla - 9. Cutback data by coating system after 1,000 hours as per ASTM B117 - 10. Cutback data by surface preparation, all coating systems after 1,000 hours as per ASTM B117 - 11. Cutback data by coating system after one year of natural exposure - 12. Cutback data by surface preparation method, all coating systems after one year of natural atmospheric exposure - 13. Three sample panels after removal from one year of natural atmospheric exposure. Surface preparation methods were (left to right) power wire brush, needle gun and abrasive blast. Some coating systems performed better than others over an SSPC-SP 11 surface. Note the massive delamination of the coating over the left two-thirds of the center panel. No trend was recognized as to why this occurred - 14. Excessive profile panels after 1,000 hours as per ASTM B117. Film thickness increases (left to right) at 10 mils WFT, then 11 mils, then 12 mils and on the far right, 14 mils WFT - 15. Average rust-through rating by primer thickness - 16. Average blister rating by primer thickness - 17. Final results of coating performance for all exposures (100 cycles GMW14872/six months natural atmospheric exposure, Ft. Lauderdale, Fla.)
- TABLE : Surface profile typeEn ligne : http://www.paintsquare.com/archive/?fuseaction=view&articleid=5870 Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28421
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Code-barres Cote Support Localisation Section Disponibilité 18240 - Périodique Bibliothèque principale Documentaires Disponible The experience factor in coating development / Gerhard Grüll in EUROPEAN COATINGS JOURNAL (ECJ), N° 9 (09/2020)
PermalinkThe importance of pattern recognition in failure analysis / Dwight G. Weldon in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 32, N° 12 (12/2015)
PermalinkThe lasting impact of titanium dioxide / Johan J. Rommens in EUROPEAN COATINGS JOURNAL (ECJ), N° 4 (04/2020)
PermalinkThe need for an independent third-party coatings inspector / Tim Bauman in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 35, N° 2 (02/2018)
PermalinkThe race for improved weathering / Matt Andersson in EUROPEAN COATINGS JOURNAL (ECJ), N° 1 (01/2021)
PermalinkTracking down the causes / Lydia Schulz-Sluka in KUNSTSTOFFE INTERNATIONAL, Vol. 106, N° 9 (09/2016)
PermalinkUltra-accelerated weathering system I : Design and functional considerations / Henry K. Hardcastle in COATINGS TECH, Vol. 7, N° 8 (08/2010)
PermalinkUnderstanding the weathering triad / Allen Zielnik in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 201, N° 4562 (07/2011)
PermalinkVers une approche cycle de vie de revêtements métalliques destinés à des applications industrielles / Nicolas Serres in MATERIAUX & TECHNIQUES, Vol. 100, N° 5 (2012)
PermalinkVersatile self-crosslinking polyurethane dispersion for low VOC coatings across multiple markets / Aditi Chavannavar in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 208, N° 4645 (10/2018)
PermalinkWeather fastness tests for surface coated materials and their evaluation methods / M. M. Gondkar in PAINTINDIA, Vol. LVI, N° 1 (01/2006)
PermalinkWeather testing of paints and coatings in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 202, N° 4576 (09/2012)
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